Apex domains cannot have CNAME records.
Question and response
Question
dig ASIA. NS
Answer
ASIA. 5 NS b0.asia.afilias-nst.asia.
ASIA. 5 NS c0.asia.afilias-nst.info.
ASIA. 5 NS a0.asia.afilias-nst.info.
ASIA. 5 NS d0.asia.afilias-nst.asia.
ASIA. 5 NS a2.asia.afilias-nst.info.
ASIA. 5 NS b2.asia.afilias-nst.org.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0